Multiplex communications – Wide area network – Packet switching
Patent
1982-08-26
1984-06-19
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 67, 370 68, H04J 302, H03K 1700
Patent
active
044556462
ABSTRACT:
A pulse code modulated digital automatic exchange for a telephone network or other communication network has a multiplicity of N input/output ports connected to an input/output system comprising a plurality of multiplexers that each scan a small group of ports in a predetermined cycle; output signals from the multiplexers are converted into M-bit parallel digital data signals and recorded in an input data store at a location identified with the port of origin. The input data store is scanned, by a fully bused synchronous transfer system, in accordance with a predetermined transfer time cycle having at least N fixed transfer time slots, one for each communication port; during the transfer time slot for any port, data recorded in the input store from that port is transferred, via an M-digit parallel data bus, to a location in an output data store associated with another port for which that data is destined. From the output store the data signals are supplied to a reverse converter and then to de-multiplexers, all part of the input/output system, connected back to the input/output ports. Sequence control circuits control the timing of operations within the transfer system to correlate the transfer of data, during a call between any two ports, so that the transfer time slot for each port in a given call becomes the input time slot for that port and the output time slot for the other port. Hook switch information, tone data, port identification data, and all other control information is bused throughout the transfer system of the exchange. For networks in which data is already in digital form, the conversion stages may be required to translate from serial to parallel form or from one digital format to another, as contrasted with the analog-to-digital conversion required for audio circuits. The input and output stores may be combined in a unified input/output store.
REFERENCES:
patent: 4020290 (1977-04-01), Perna et al.
patent: 4071701 (1978-01-01), Leisonhufvud et al.
patent: 4131763 (1978-12-01), Herschtal
patent: 4168401 (1979-09-01), Molleron et al.
patent: 4322843 (1982-03-01), Beuscher et al.
Olms Douglas W.
Scully Richard L.
Scutch III Frank M.
LandOfFree
Pulse code modulated digital automatic exchange does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pulse code modulated digital automatic exchange, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulse code modulated digital automatic exchange will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-417097